Achieving 'A+' ranks on every level is a significant challenge and a core 'side activity' for many players. This involves maximizing your combo multiplier, using several weapons, and clearing levels quickly and efficiently. To get high scores:

- Maintain Combos: The most crucial factor. Kill enemies in quick succession. Plan your routes to chain kills together.
- Variety Bonus: Use different weapons and execution types. Don't just stick to one weapon.
- Speed Bonus: Clear levels as fast as possible.
- Risk Bonus: Taking on multiple enemies or using riskier tactics can sometimes lead to higher scores if successful.
- Executions: Always execute downed enemies for extra points.
Replaying levels with different strategies and focusing on combo routes is the key to mastering the scoring system and climbing the leaderboards.